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Finding the Fourth Proportional to 390.93, 586 and 217.67

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Solution

The fourth proportional to 390.93, 586 and 217.67 is: 326.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.93 : 586 = 217.67 : x
  2. Step 2: Convert to fraction form
    390.93/586 = 217.67/x
  3. Step 3: Cross multiply
    390.93x = 586 × 217.67
  4. Step 4: Simplify right side
    390.93x = 127,554.62
  5. Step 5: Solve for x
    x = 127,554.62/390.93
  6. Step 6: Final answer
    x = 326.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.